is a rare variety of Fluorite that contains an appreciable amount
of yttrium (Y). It was first
described as a new mineral species in 1911 by Norwegian geologist,
Dr. Thorolf Vogt (1888-1958), under the name ‘‘yttrofluorite’’,
but was discredited by the IMA in 2006 as a variety
of Fluorite. It was originally reported from Hundholmen, Tysfjord, Nordland, Norway.
to Vogt, Yttrofluorite has a higher specific gravity
and poorer cleavage than Fluorite and the color is
usually yellow to yellow-brown, but can also be brown
or yellow-green and has a vitreous lustre on its
cleavages. Yttrofluorite may also fluoresce a weak to
strong white to greenish
white under shortwave UV light. If you place your cursor
over the picture above you will see the Yttrofluorite gem
under SW UV light.
distribution: at the type locality, Hundholmen, Tysfjord, Nordland, Norway.
Also in Norway at the Øvre Lapplægeret Quarry, Lapplægeret, Drag, Tysfjord, Nordland.
the USA there are several localities located in Colorado: the
White Cloud Pegmatite,
Little Patsy Pegmatite, and the Big Bertha Mine, South Platte Pegmatite District
and the S. B. Strang Ralston Creek Pegmatite, Jefferson County.
At the Globe Pegmatite, Alamos area, Petaca District, Rio Arriba County, New Mexico.
Several other localities have been reported
including Janet ore occurrence,
Kara-Oba W deposit, Betpakdala Desert, Karaganda Oblast', Kazakhstan.
In Russia at Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region.
In the Xihuashan ore field, Dayu Co., Ganzhou Prefecture, Jiangxi Province, China.